Finding the Fourth Proportional to 78,727.18, 108,643.20 and 42,917.08

Step by Step Solution

1. Step 1: Write the proportion equation
   78,727.18 : 108,643.20 = 42,917.08 : x
2. Step 2: Convert to fraction form
   78,727.18/108,643.20 = 42,917.08/x
3. Step 3: Cross multiply
   78,727.18x = 108,643.20 × 42,917.08
4. Step 4: Simplify right side
   78,727.18x = 4,662,648,905.86
5. Step 5: Solve for x
   x = 4,662,648,905.86/78,727.18
6. Step 6: Final answer
   x = 59,225.40